Garden bed planting grid calculator

How the estimate works

On each axis, subtract both edge margins. If the remainder is negative, the count is zero; otherwise divide by the relevant spacing, round down and add one. The first centre is at the starting margin. Further centres follow the chosen spacing and cannot cross the opposite margin. Extra space stays at the far end; the grid is not automatically centred.

Counts point centres, not the size or health of living plants. Choose spacing suitable for your own plants and check their seed or plant guidance. No paths, irregular beds, staggered rows, mixed crops, yield or optimum packing are modeled. Margins belong to the physical length and width axes even when rows rotate. If the margins meet exactly, one centre can lie on that axis.

Check the filled example

Chosen example: 300 × 120 cm, 30 cm within rows, 40 cm between rows, 15 cm margins on both axes. Along the length: 10 positions × 3 rows = 30. Along the width: 4 × 7 = 28. These are illustrative dimensions, not crop-spacing recommendations.

Accepted input values

Inputs are accepted as finite numbers; the accepted values are shown below. Integer counts are calculated from their decimal representations and displayed in full, including very large counts. This does not remove input precision limits.

Bed length, cm

300

Bed width, cm

120

Distance between centres within a row, cm

30

Distance between row centres, cm

40

Margin at each end of the length axis, cm

15

Margin at each end of the width axis, cm

15

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